SICK LFV 310 User manual

GB
OPERATING INSTRUCTIONS
LFV 310
Contactless electronic switch

2
Contents
LFV 310 • Contactless electronic switch
8014376 / 1LKL
Contents
1 About this document ............................................................................................................... 4
1.1 Function ........................................................................................................................... 4
1.2 Target group ..................................................................................................................... 4
1.3 Symbols used................................................................................................................... 4
2 For your safety ......................................................................................................................... 5
2.1 Authorised personnel ....................................................................................................... 5
2.2 Appropriate use................................................................................................................ 5
2.3 Warning about incorrect use............................................................................................. 5
2.4 General safety instructions............................................................................................... 5
2.5 Conformity........................................................................................................................ 5
2.6 Installation and operation in the USA and Canada ........................................................... 6
2.7 Safety instructions for Ex areas ........................................................................................ 6
3 Product description ................................................................................................................. 7
3.1 Conguration.................................................................................................................... 7
3.2 Principle of operation........................................................................................................ 8
3.3 Adjustment ....................................................................................................................... 8
3.4 Packaging, transport and storage..................................................................................... 9
3.5 Accessories...................................................................................................................... 9
4 Mounting................................................................................................................................. 11
4.1 General instructions ....................................................................................................... 11
4.2 Mounting instructions ..................................................................................................... 14
5 Connecting to power supply................................................................................................. 16
5.1 Preparing the connection ............................................................................................... 16
5.2 Connection procedure.................................................................................................... 17
5.3 Wiring plan, single chamber housing.............................................................................. 17
6 Setup ....................................................................................................................................... 20
6.1 General information........................................................................................................ 20
6.2 Adjustment elements...................................................................................................... 20
6.3 Function table................................................................................................................. 21
7 Maintenanceandfaultrectication...................................................................................... 23
7.1 Maintenance .................................................................................................................. 23
7.2 Rectify faults................................................................................................................... 23
7.3 Exchanging the electronics ............................................................................................ 24
7.4 How to proceed if a repair is necessary.......................................................................... 25
8 Dismount................................................................................................................................. 26
8.1 Dismounting steps.......................................................................................................... 26
8.2 Disposal ......................................................................................................................... 26
9 Supplement ............................................................................................................................ 27
9.1 Technical data ................................................................................................................ 27
9.2 Dimensions .................................................................................................................... 33
9.3 Trademark ...................................................................................................................... 36

3
Contents
LFV 310 • Contactless electronic switch
8014376 / 1LKL
Safety instructions for Ex areas:
TakenoteoftheExspecicsafetyinstructionsforExapplications.
These instructions are attached as documents to each instrument
with Ex approval and are part of the operating instructions.
Editing status: 2024-01-18

4
1 About this document
LFV 310 • Contactless electronic switch
8014376 / 1LKL
1 About this document
1.1 Function
This instruction provides all the information you need for mounting,
connection and setup as well as important instructions for mainte-
nance,faultrectication,safetyandtheexchangeofparts.Please
read this information before putting the instrument into operation and
keep this manual accessible in the immediate vicinity of the device.
1.2 Target group
This instruction manual is directed to trained personnel.The contents
ofthismanualmustbemadeavailabletothequaliedpersonneland
implemented.
1.3 Symbols used
Information, note, tip: This symbol indicates helpful additional infor-
mation and tips for successful work.
Note: This symbol indicates notes to prevent failures, malfunctions,
damage to devices or plants.
Caution: Non-observance of the information marked with this symbol
may result in personal injury.
Warning: Non-observance of the information marked with this symbol
may result in serious or fatal personal injury.
Danger: Non-observance of the information marked with this symbol
results in serious or fatal personal injury.
Ex applications
This symbol indicates special instructions for Ex applications.
• List
The dot set in front indicates a list with no implied sequence.
1 Sequence of actions
Numbers set in front indicate successive steps in a procedure.
Disposal
This symbol indicates special instructions for disposal.

5
2 For your safety
LFV 310 • Contactless electronic switch
8014376 / 1LKL
2 For your safety
2.1 Authorised personnel
All operations described in this documentation must be carried out
only by trained and authorized personnel.
During work on and with the device, the required personal protective
equipment must always be worn.
2.2 Appropriate use
The LFV 310 is a sensor for point level detection.
Youcannddetailedinformationabouttheareaofapplicationin
chapter "Product description".
Operational reliability is ensured only if the instrument is properly
usedaccordingtothespecicationsintheoperatinginstructions
manual as well as possible supplementary instructions.
2.3 Warning about incorrect use
Inappropriate or incorrect use of this product can give rise to applica-
tion-specichazards,e.g.vesseloverllthroughincorrectmounting
or adjustment. Damage to property and persons or environmental
contamination can result. Also, the protective characteristics of the
instrument can be impaired.
2.4 General safety instructions
This is a state-of-the-art instrument complying with all prevailing
regulations and directives. The instrument must only be operated in
atechnicallyawlessandreliablecondition.Theoperatingcompany
is responsible for the trouble-free operation of the instrument. When
measuring aggressive or corrosive media that can cause a danger-
ous situation if the instrument malfunctions, the operating company
has to implement suitable measures to make sure the instrument is
functioning properly.
The safety instructions in this operating instructions manual, the
national installation standards as well as the valid safety regulations
and accident prevention rules must be observed.
For safety and warranty reasons, any invasive work on the device
beyond that described in the operating instructions manual may be
carried out only by personnel authorised by us. Arbitrary conversions
ormodicationsareexplicitlyforbidden.Forsafetyreasons,onlythe
accessoryspeciedbyusmustbeused.
To avoid any danger, the safety approval markings and safety tips on
the device must also be observed.
2.5 Conformity
On www.sick.comyoucanndconformitydeclarations,certicates
and current operating instructions of the product. For this purpose,
enterthearticlenumberoftheproductinthesearcheld(articlenum-
ber:seetypeplateentryintheeld"P/N"or"Ident.no.").

6
2 For your safety
LFV 310 • Contactless electronic switch
8014376 / 1LKL
Additional information:
• Model-speciconlinedatasheetsforinstrumentversionswith
technical data, dimensional drawings and diagrams
• Dimensional drawings or 3D CAD dimensional models in various
electronic formats
• Furtherpublicationsinrelationtothesensorsdescribedhere(e.g.
IO-Link)
• Accessories publications
2.6 Installation and operation in the USA and
Canada
This information is only valid for USA and Canada. Hence the follow-
ing text is only available in the English language.
Installations in the US shall comply with the relevant requirements of
theNationalElectricalCode(NEC-NFPA70)(USA).
Installations in Canada shall comply with the relevant requirements of
theCanadianElectricalCode(CECPartI)(Canada).
2.7 Safety instructions for Ex areas
Forapplicationsinhazardousareas(Ex),onlydeviceswithcorre-
spondingExapprovalmaybeused.ObservetheEx-specicsafety
instructions.These are an integral part of the device documentation
and are enclosed with every device with Ex approval.

7
3 Product description
LFV 310 • Contactless electronic switch
8014376 / 1LKL
3 Product description
3.1 Conguration
The scope of delivery encompasses:
• LFV 310 point level switch
The further scope of delivery encompasses:
• Documentation
– Operating instructions LFV 310
– Ex-specic"Safety instructions"(withExversions)
– Ifnecessary,furthercerticates
Information:
Optional instrument features are also described in this operating
instructions manual. The respective scope of delivery results from the
orderspecication.
The LFV 310 consists of the components:
• Housing lid
• Housing with electronics
• Processttingwithtuningfork
1
2
3
Fig. 1: LFV 310
1 Housing lid
2 Housing with electronics
3 Processtting
Thetypelabelcontainsthemostimportantdataforidenticationand
use of the instrument:
• Instrument type
• Information about approvals
• Congurationinformation
• Technical data
• Serial number of the instrument
• QRcodefordeviceidentication
• Manufacturer information
Further information can be found on our homepage.
Scope of delivery
Constituent parts
Type label
Documents and software

8
3 Product description
LFV 310 • Contactless electronic switch
8014376 / 1LKL
Thereyouwillndthedocumentationandfurtherinformationabout
the device.
3.2 Principle of operation
LFV 310 is a point level sensor with tuning fork for point level detec-
tion.
It is designed for industrial use in all areas of process technology and
can be used in liquids.
Typicalapplicationsareoverllanddryrunprotection.Withitstuning
fork of only 40 mm length, LFV 310 can also be mounted e.g. in pipe-
lines from DN 32. The small tuning fork allows use in vessels, tanks
and pipes.Thanks to its simple and robust measuring system, LFV
310isvirtuallyunaectedbythechemicalandphysicalpropertiesof
the liquid.
Itfunctionsevenunderdicultconditionssuchasturbulence,airbub-
bles, foam generation, buildup, strong external vibration or changing
products.
Function monitoring
The electronics module of LFV 310 continuously monitors the follow-
ing criteria via frequency evaluation:
• Strong corrosion or damage on the tuning fork
• Loss of vibration
• Line break to the piezo drive
If a malfunction is detected or in case of voltage supply, the electron-
icstakesonadenedswitchingstatus,i.e.thecontactlesselectronic
switchopens(safestate).
The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 1200 Hz.The piezos are
xedmechanicallyandarehencenotsubjecttotemperatureshock
limitations. The frequency changes when the tuning fork is covered
by the medium.This change is detected by the integrated electronics
module and converted into a switching command.
LFV 310 is a compact instrument, i.e. it can be operated without
external evaluation system. The integrated electronics evaluates the
level signal and outputs a switching signal. With this switching signal,
aconnecteddevicecanbeoperateddirectly(e.g.awarningsystem,
apumpetc.).
Thedataforpowersupplyarespeciedinchapter"Technical data".
3.3 Adjustment
The switching condition of LFV 310 with plastic housing can be
checkedwhenthehousingisclosed(signallamp).Withthebasic
setting,productswithadensity≥0.7g/cm³(0.025lbs/in³)canbede-
tected. The instrument can be adapted if products with lower density
are to be measured.
Application area
Functional principle
Voltage supply

9
3 Product description
LFV 310 • Contactless electronic switch
8014376 / 1LKL
Ontheelectronicsmoduleyouwillndthefollowingdisplayand
adjustment elements:
• Signallampforindicationoftheswitchingcondition(green/red)
• DIL switch for sensitivity adjustment
• Modeadjustmentforselectionoftheswitchingcondition(A/B)
3.4 Packaging, transport and storage
Your instrument was protected by packaging during transport. Its
capacity to handle normal loads during transport is assured by a test
based on ISO 4180.
The packaging of standard instruments consists of environment-
friendly, recyclable carton material. The sensing element is additional-
ly protected with a cardboard cover. For special versions, PE foam or
PE foil is also used. Please dispose of the packaging material through
specialised recycling companies.
Transport must be carried out in due consideration of the notes on the
transport packaging. Nonobservance of these instructions can cause
damage to the device.
The delivery must be checked for completeness and possible transit
damage immediately at receipt. Ascertained transit damage or con-
cealed defects must be appropriately dealt with.
Up to the time of installation, the packages must be left closed and
stored according to the orientation and storage markings on the
outside.
Unless otherwise indicated, the packages must be stored only under
the following conditions:
• Not in the open
• Dry and dust free
• Not exposed to corrosive media
• Protected against solar radiation
• Avoiding mechanical shock and vibration
• Storage and transport temperature see chapter "Supplement -
Technical data - Ambient conditions"
• Relative moisture 20 … 85 %
Withinstrumentweightsofmorethan18kg(39.68lbs)suitableand
approved equipment must be used for lifting and carrying.
3.5 Accessories
Screwedangesareavailableindierentversionsaccordingtothe
followingstandards:DIN2501,EN1092-1,BS10,ASMEB16.5,
JISB2210-1984,GOST12821-80.
For connecting the sensors with a separator to voltage supply or sig-
nal processing, the sensors are also available with plug connectors.
The following plug connectors are available:
Packaging
Transport
Transport inspection
Storage
Storage and transport
temperature
Lifting and carrying
Flanges
Plug connector

10
3 Product description
LFV 310 • Contactless electronic switch
8014376 / 1LKL
• M12 x 1
• ISO 4400
• Harting HAN 7D
• Harting HAN 8D
• Amphenol-Tuchel

11
4 Mounting
LFV 310 • Contactless electronic switch
8014376 / 1LKL
4 Mounting
4.1 General instructions
Note:
For safety reasons, the instrument must only be operated within the
permissibleprocessconditions.Youcannddetailedinformationon
the process conditions in chapter "Technical data" of the operating
instructions or on the type label.
Hence make sure before mounting that all parts of the instrument ex-
posed to the process are suitable for the existing process conditions.
These are mainly:
• Active measuring component
• Processtting
• Process seal
Process conditions in particular are:
• Process pressure
• Process temperature
• Chemical properties of the medium
• Abrasionandmechanicalinuences
The instrument is suitable for standard and extended ambient condi-
tionsacc.toDIN/EN/BSEN/IEC/ANSI/ISA/UL/CSA61010-1.Itcanbe
used indoors as well as outdoors.
In general, LFV 310 can be installed in any position.The instrument
only has to be mounted in such a way that the tuning fork is at the
height of the desired switching point.
Thetuningforkhaslateralmarkings(notches)thatindicatethe
switching point with vertical mounting. The switching point applies
to water in conjunction with the basic setting of the density switch
≥0.7g/cm³(0.025lbs/in³).WhenmountingLFV310,makesurethat
this marking is at the height of the requested switching point. Keep in
mind that the switching point of the instrument will shift if the medium
hasadensityotherthanwater-wateris1g/cm³(0.036lbs/in³).For
products≤0.7g/cm³(0.025lbs/in³)and≥0.5g/cm³(0.018lbs/in³)
thedensityswitchmustbesetto≥0.5g/cm³.
Keepinmindthatfoamswithadensity≥0.45g/cm³(0.016lbs/in³)
are detected by the sensor. This can lead to erroneous switchings,
particulary when the sensor is used for dry run protection.
Process conditions
Ambient conditions
Switching point

12
4 Mounting
LFV 310 • Contactless electronic switch
8014376 / 1LKL
2
3
14
Fig. 2: Vertical mounting
1 Switching point approx. 13 mm (0.51 in)
2 Switching point with lower density
3 Switching point with higher density
4 Switching point approx. 27 mm (1.06 in)
1
2
Fig. 3: Horizontal mounting
1 Switching point
2 Marking with screwed version, facing up
1
2
Fig. 4: Horizontal installation (recommended mounting position, particularly for
adhesive products)
1 Switching point
2 Marking with screwed version, facing up
Inthecaseofangeversions,theforkisalignedasfollows.

13
4 Mounting
LFV 310 • Contactless electronic switch
8014376 / 1LKL
1
Fig.5:Forkpositionwithangeversions
1 Markingwithangeversion,facingup
Protect your instrument against moisture ingress through the following
measures:
• Useasuitableconnectioncable(seechapter"Connecting to
power supply")
• Tighten the cable gland or plug connector
• Lead the connection cable downward in front of the cable entry or
plug connector
This applies mainly to outdoor installations, in areas where high
humidityisexpected(e.g.throughcleaningprocesses)andoncooled
or heated vessels.
Note:
Make sure that during installation or maintenance no moisture or dirt
can get inside the instrument.
To maintain the housing protection, make sure that the housing lid is
closed during operation and locked, if necessary.
Caution:
DonotholdLFV310onthetuningfork.Particularlywithangeor
tube versions, the tuning fork can be damaged just by the weight of
the instrument. Transport coated instruments very carefully and avoid
touching the tuning fork.
Remove the packaging or the protective cover just before mounting.
The vibrating level switch is a measuring instrument and must be
treatedaccordingly.Bendingthevibratingelementwilldestroythe
instrument.
Warning:
The housing must not be used to screw the instrument in! Applying
tightening force can damage internal parts of the housing.
Use the hexagon above the thread for screwing in.
Protection against mois-
ture
Transport
Handling

14
4 Mounting
LFV 310 • Contactless electronic switch
8014376 / 1LKL
Metric threads
In the case of instrument housings with metric thread, the cable
glands are screwed in at the factory. They are sealed with plastic
plugs as transport protection.
You have to remove these plugs before electrical connection.
NPT thread
In the case of instrument housings with self-sealing NPT threads, it is
not possible to have the cable entries screwed in at the factory. The
free openings for the cable glands are therefore covered with red dust
protection caps as transport protection.The dust protection caps do
notprovidesucientprotectionagainstmoisture.
Prior to setup you have to replace these protective caps with ap-
proved cable glands or close the openings with suitable blind plugs.
4.2 Mounting instructions
LFV310hasadenedthreadstartingpoint.Thismeansthatevery
LFV 310 is in the same fork position after being screwed in. Remove
therefore the supplied seal from the thread of LFV 310. This seal is
not required when using a welded socket with O-ring in front.
Keep in mind that this welded socket is not suitable for coated instru-
ment versions.
Screw LFV 310 completely into the welded socket. The later position
can be determined already before welding. Mark the appropriate
positionoftheweldedsocket.Beforewelding,unscrewLFV310and
remove the rubber ring from the welded socket. The welded socket
hasamarking(notch).Weldthesocketwiththenotchfacingupward,
orincaseofpipelines(DN32uptoDN50),alignedwiththedirection
ofow.
1
Fig. 6: Marking on the welded socket
1 Marking
In case of horizontal mounting in adhesive and viscous products,
the surfaces of the tuning fork should be vertical in order to reduce
builduponthetuningfork.Onthescrewedversionyouwillnda
marking on the hexagon. With this you can check the position of the
tuning fork when screwing it in. When the hexagon touches the seal,
thethreadcanstillbeturnedbyapprox.halfaturn.Thisissucientto
reach the recommended installation position.
Inthecaseofangeversions,theforkisalignedwiththeangeholes.
Cable glands
Welded socket
Adhesive products

15
4 Mounting
LFV 310 • Contactless electronic switch
8014376 / 1LKL
When used in adhesive and viscous products, the tuning fork should
protrude into the vessel to avoid buildup. For that reason, nozzles
forangesandmountingbossesshouldbeavoidedwhenmounting
horizontally.
Theprocessttingmustbesealedifthereisgaugeorlowpressure
inthevessel.Beforeuse,checkifthesealingmaterialisresistant
against the measured product and the process temperature.
Themax.permissiblepressureisspeciedinchapter"Technical
data" or on the type label of the sensor.
IfLFV310ismountedinthellingstream,unwantedfalsemeasure-
ment signals can be generated. For this reason, mount LFV 310 at a
positioninthevesselwherenodisturbances,e.g.fromllingopen-
ings, agitators, etc., can occur.
To make sure the tuning fork of LFV 310 generates as little resistance
aspossibletoproductow,mountthesensorsothatthesurfacesare
parallel to the product movement.
Pressure/Vacuum
Inowingmedium
Productow

16
5 Connecting to power supply
LFV 310 • Contactless electronic switch
8014376 / 1LKL
5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
Warning:
Connect only in the complete absence of line voltage.
• The electrical connection must only be carried out by trained,
qualiedpersonnelauthorisedbytheplantoperator.
• Alwaysswitchopowersupply,beforeconnectingordisconnect-
ing the instrument.
Note:
Install a disconnecting device for the instrument which is easy to
access.The disconnecting device must be marked for the instrument
(IEC/EN61010).
In hazardous areas you must take note of the respective regulations,
conformityandtypeapprovalcerticatesofthesensorsandpower
supply units.
Connect the voltage supply according to the connection diagrams.
The electronics module SWE60C is designed in protection class I.
To maintain this protection class, it is absolutely necessary that the
earth conductor be connected to the inner earth conductor terminal.
Keep the general installation regulations in mind. Take note of the
corresponding installation regulations for hazardous areas with Ex
applications.
Thedataforpowersupplyarespeciedinchapter"Technical data".
The instrument is connected with standard three-wire cable without
shielding. If electromagnetic interference is expected which is above
the test values of EN 61326 for industrial areas, shielded cable should
be used.
Make sure that the cable used has the required temperature resist-
anceandresafetyformax.occurringambienttemperature
Use cable with round cross-section. A cable outer diameter of
5…9mm(0.2…0.35in)ensuresthesealeectofthecablegland.
Ifyouareusingcablewithadierentdiameterorcross-section,
exchange the seal or use a suitable cable gland.
In hazardous areas, use only approved cable connections for LFV
310.
Take note of the corresponding installation regulations for Ex applica-
tions.
Cover all housing openings conforming to standard according to
EN 60079-1.
Note safety instructions
Take note of safety
instructions for Ex
applications
Voltage supply
Connection cable
Connection cable
for Ex applications

17
5 Connecting to power supply
LFV 310 • Contactless electronic switch
8014376 / 1LKL
5.2 Connection procedure
With Ex instruments, the housing cover may only be opened if there is
no explosive atmosphere present.
Proceed as follows:
1. Unscrew the housing lid
2. Loosen compression nut of the cable gland and remove blind
plug
3. Removeapprox.10cm(4in)ofthecablemantle,stripapprox.
1cm(0.4in)ofinsulationfromtheendsoftheindividualwires
4. Insert the cable into the sensor through the cable entry
5. Open the terminals with a screwdriver
6. Insert the wire ends into the open terminals according to the wir-
ing plan
7. Tighten the terminals with a screwdriver
8. Check the hold of the wires in the terminals by lightly pulling on
them
9. Tighten the compression nut of the cable entry gland. The seal
ring must completely encircle the cable
10. Screw the housing lid back on
Theelectricalconnectionisnished.
5.3 Wiring plan, single chamber housing
The following illustrations apply to the non-Ex as well as to the Ex d
version.
1 2
4 4
4
3
Fig. 7: Material versions, single chamber housing
1 Plastic (not with Ex d)
2 Aluminium
3 Stainless steel (electro-polished)
4 Filter element for pressure compensation (not with Ex d)
Housing overview

18
5 Connecting to power supply
LFV 310 • Contactless electronic switch
8014376 / 1LKL
20-250V AC/DC
max 400mA
A
B
L
N
LN
12
0,5 g / cm3
0,7 g / cm3
+
+
12 12
SW E60C
3
5
1
2
4
Fig. 8: Electronics and connection compartment, single chamber housing
1 Control lamp
2 DIL switch for mode adjustment
3 DIL switch for switching point adaptation
4 Ground terminal
5 Connection terminals
We recommend connecting LFV 310 in such a way that the switching
circuitisopenwhenthereisalevelsignal,linebreakorfailure(safe
state).
Information:
The contactless electronic switch is always shown in non-operative
condition.
Warning:
The instrument must not be operated without an intermediately
connected load, because the electronics would be destroyed if con-
nected directly to the mains. It is not suitable for connection to low
voltage PLC inputs.
For direct control of relays, contactors, magnet valves, warning lights,
horns etc.
Domestic current is temporarily lowered below 1 mA after switching
otheloadsothatcontactors,whoseholdingcurrentislowerthan
the constant domestic current of the electronics, are reliably switched
o.
WhenLFV310isusedaspartofanoverllprotectionsystemaccord-
ing to WHG, also note the regulations of the general type approval.
Electronics and connec-
tion compartment
Wiring plan

19
5 Connecting to power supply
LFV 310 • Contactless electronic switch
8014376 / 1LKL
12
LN
+
Fig. 9: Wiring plan, single chamber housing

20
6 Setup
LFV 310 • Contactless electronic switch
8014376 / 1LKL
6 Setup
6.1 General information
Theguresinbracketsrefertothefollowingillustrations.
With plastic housings, the switching condition of the electronics can
becheckedwhenthehousingcoverisclosed(controllamp).Withthe
basicsetting,productswithadensity≥0.7g/cm³(0.025lbs/in³)can
be detected. For products with lower density, the switch must be set
to≥0.5g/cm³(0.018lbs/in³).
Ontheelectronicsmoduleyouwillndthefollowingdisplayand
adjustment elements:
• Signallamp(1)
• DILswitchformodeadjustment-A/B(2)
• DILswitchforadjustmentofthedensityrange(3)
Note:
Always immerse the tuning fork of LFV 310 in a liquid to test its func-
tion. Do not test the function of LFV 310 with your hand. This can
damage the sensor.
6.2 Adjustment elements
12
1
2
3
Fig. 10: Oscillator SWE60C - Contactless electronic switch
1 Control lamp (LED)
2 DIL switch for mode adjustment
3 DIL switch for adjustment of the density range
Control lamp for indication of the switching status
• Green = Output closed
• Red = Output open
• red(ashing)=failure
Withthemodeadjustment(A/B)youcanchangetheswitching
condition of the relay.You can set the required mode according to the
Function/Conguration
Signal lamp (1)
Mode adjustment (2)